The original bosses all drop item level 860 gear for a specific slot, a relic, and trinket, ring, neck, or back item.

The Patch 7.2 bosses drop item level 900 gear.

Ana-Mouz
This foul imp mother rests deep within Felsoul Hold, immersed in a pool of pure Fel energy. Her children swarm around her, as she soaks in the fetid air and corrupts anything that comes within her grasp.

Impish Flames - Ana-Mouz unleashes a spout of Fel flames inflicting 1,250,000 Fire damage to all enemies in a cone in front of her. In addition, the damage of Impish Flames is increased by 100% for 30 sec.

Apocron
Built by the Legion thousands of years ago, Apocron has heralded the end for countless civilizations. With each world conquered, the reaver's power grows, ensuring the next realm it encounters will be put to flame.

Sear - Looses a gout of flame, inflicting 1,200,000 Fire damage to all enemies within 20 yards in front of the caster and reducing armor by 20% for 12 sec.

Brutallus
The pit lord Brutallus is a veteran of many battles, including the most recent battle at the Sunwell. His tactics are rarely sophisticated, often relying on pure force to dominate enemy armies.

Meteor Slash - Inflicts 12,000,000 Fire damage divided between all enemies in a cone within 50 yds in front of Brutallus. Affected enemies also take an additional 50% Fire damage from all sources for 15 sec.

Crashing Embers - Flaming embers crash down from the sky, inflicting 150,000 Fire damage to all enemies within 10 on impact. Affected enemies also take 200,000 Fire damage every 1 sec. and are confused for 3 sec.

Rupture - Brutallus crashes down rupturing the earth under 5 enemies, inflicting 700,000 Physical damage and knocking down enemies who remain in the area.

Calamir
A being of immense magical power, Calamir was called forth by the ancient exemplars in their howling rage. Imbued with the powers of Fire, Frost, and Arcane, Calamir eradicates those who dare to stand in his way.

Arcanopulse - Several arcane pulses begin to orbit the caster. Players coming into contact with the pulse suffer 478,100 Arcane damage and are teleported 15 yds in a random direction, stunning them for 2 sec.

Arcane Desolation - Releases a wave of magic, inflicting 115,000 Arcane damage to all players and knocking them into the air.

Drugon the Frostblood
Drugon the Frostblood has terrorized the tribes of Highmountain from atop its frozen peaks for ages. Now, seeing opportunity in the chaos, this powerful ettin descends from his perch to claim the region for himself.

Snow Crash - Smashes the ground, inflicting 750,000 Physical damage to targets caught in the area of destruction and knocking them back.

Avalanche - Grabs a hunk of ice and tosses it at a random enemy destination, inflicting 300,000 Frost damage to enemies within 8 yards and 95,000 Frost damage to all other players.Also causes additional shards to launch from the impact location and inflict an additional 70,000 Frost damage to nearby enemies.

Frozen - Encases enemies in snow, rendering them unable to act. This effect increases damage taken by 50%.

Snow Plow - Drugon notices something shiny and fixates on a random enemy target. Enemies caught in his path receive 30,000 Physical damage and are knocked back. If he catches his target, he inflicts 120,000 Physical damage every 1 sec.

Flotsam
Flotsam emerged from the ocean depths to sate his hunger. The first to cross his path were the swamp murlocs of Shipwreck Cove, which Flotsam devoured by the dozens. Despite consuming most of their tribe, these creatures worshipped the giant as a god, and continued feeding him family and friends until the beast passed out. When he awakens, Flotsam will expand his menu to include everyone within the region.

Overview - As the fight progresses, Flotsam hurls Jetsam at random targets. Once the boss has full energy, he uses Getsam to damage all enemies and destroys any Jetsam on the field, inflicting additional damage to nearby targets. Flotsam also uses Yaksam to summon Regurgitated Marshstompers that will fixate random targets and continually spray Oozing Bile.

Breaksam - Smashes the ground, inflicting 750,000 Physical damage to targets caught in the area of destruction and knocking them back.

Yaksam - A portion of Flotsam's lunch escapes his gullet, inflicting 75,000 Nature damage to all targets in a cone in front of the caster every 0.25 sec for 1.2 sec.The breath also summons undigested murlocs who begin attacking nearby enemies.

Regurgitated Marshstomper - Spit up during the encounter and begin attacking random enemies.

Humongris
Humongris has always had the dream of wielding magic. After finding he had no aptitude in the arcane arts, Humongris instead settled for wielding a wizard. Humongris sought out and captured the mage Padawsen and now wields him as a wand, using threats of violence and a tightening grip to hurl magic around the battlefield.

Overview - Levantus uses a variety of attacks that are very difficult to dodge when swimming through water. Remember to use Gust of Wind often to avoid damage!

Damage Dealers -

Grab the water walking ability from Gust of Wind to maintain your mobility while fighting Levantus.

Run around Levantus while she casts Massive Spout to avoid taking massive damage.

Healers -

Grab the water walking ability from Gust of Wind to maintain your mobility while fighting Levantus.

Run around Levantus while she casts Massive Spout to avoid taking massive damage.

Tanks -

Swim around Levantus while she casts Massive Spout to avoid taking massive damage.

Try to stay in melee range as often as possible to prevent Levantus from using Rampaging Torrent.

Gust of Wind - Gusts of wind periodically appear in the waters surrounding Levantus. Coming into contact with these gusts knocks a player into the air and grants them the ability to walk on water for 45 sec. Any damage taken will remove this effect.

Rampaging Torrent - Levantus thrashes about violently when no players are in melee combat, inflicting 165,000 Frost damage to all players and increasing Frost damage taken by 10% for 30 sec. This effect stacks.

Malificus
A creature of pure malice, Malificus incites terror in the hearts of all those who oppose him. Portents of his arrival come in the form of mass panics among citizens, and death cults celebrating the end of days.

Incite Panic - Malificus drives twisted thoughts into the heads of 3 enemies, causing them to flee in terror for 4 sec. Any players within 8 yards of the fleeing target after 4 sec will themselves flee in terror for 4 sec.

Pestilence - Creates an area of Virulent Infection at the feet of 4 enemies within 50 yards.

Na'zak the Fiend
The alpha of the Fal'dorei, this terrifying monstrosity lurks deep within the Falanaar Tunnels. As he churns through the rubble, he uncovers ley-infused stones and feeds upon their arcane energy to sustain himself, biding his time for more worthy prey.

Overview - During the fight, Na'zak the Fiend shakes Ley-Infused Rubble loose from the ceiling, and begins to absorb its energy with Absorb Leystones. For each Leystone still on the ground when he finishes casting, Na'zak gains a charge of Ley Infusion.

Foundational Collapse - Na'zak shakes the very foundations of the Falanaar Tunnel, dropping rubble infused with power from the Leylines. Na'zak will then attempt to absorb the energy within these stones if enemies do not get to them first.

Web Wrap - Na'zak wraps up to three enemies in webbing, rendering the targets unable to move for 10 sec, or until the webbing is destroyed.

Nithogg
The great dragon Nithogg was once of the Thorignir, having left the brood shortly after they swore fealty to the titan keepers. Nithogg believed that one day he would be more powerful than even the keepers, and refused to be their subject. Instead, he took up roost in the mountain Nastrondir, where he raises his brood and terrorizes the nearby lands whenever the mood strikes him.

Crackling Jolt - Nithogg unleashes bolts of crackling lightning that strike at the location of all players, inflicting 750,000 Nature damage to all targets within 4 yards of the impact.

Tail Lash - Inflicts 350,000 Physical damage to players in a cone behind him, knocking them into the air.

Electrical Storm - Nithogg creates a vortex of electric current that inflicts 250,000 Nature damage every 2 sec while players are near the vortex.

Storm Breath - Nithogg unleashes a blast of electricity from his maw inflicting 1,250,000 Nature damage to all enemies in a cone in front of him. In addition, the damage of Storm Breath is increased by 100% for 30 sec.

Lightning Rod - Nithogg changes the polarity of up to 5 players, causing them to attract Static Orbs to their location.

Unstable Explosion - Upon reaching a player affected by Lightning Rod, the Static Orb bursts inflicting 225,000 Nature damage to all enemies within 8 yards. In addition, haste and movement speed are reduced by 15% for 8 sec.

Shar'thos
This guardian of the glades has been beset by the Nightmare's corruption. Where once he breathed life into the woods, he now leaves a trail of decay and destruction in his wake.

Si'vash
Si'vash commands the fury of the sea, bringing its power to bear on those too close to shore. Her fierce Si'vashi Honor Guard travel with her across Azeroth's oceans, eager for vulnerable harbors to destroy.

The Soultakers
Sent by Helya to raid the crypts of noble vrykul kings, this trio of raiders and their crew has found their way into the Tomb of the Old Kings and seek to claim the souls that rest there.

Withered J'im
Cast out from the sanctuary of Suramar, this nightfallen wandered the coastline as his body deteriorated, and his sanity along with it. Just as he was about to lose the last vestiges of personhood, he sensed a radiating energy from a nearby cave. Within, he found a shard of power originating from the Nightwell itself. It sustains and empowers him, but also warps the flow of time and space nearby. It has broken his mind completely. Now, no one enters the cave of Withered J'im. Even fools know better.

Resonance - Conjures a bulwark of arcane magic around the caster for 15 sec. The bulwark reduces damage taken by 30% and spawns Unstable Resonances when receiving damage.Unstable Resonances explode for massive Arcane damage after 20 sec to targets within 5 yards if not defeated.